Collapsible drum



Jan. 10, 1967 w T, 5 ET AL COLLAPS IBLE DRUM 2 Sheets-Sheet 1 Filed April 4, 1963 INVENTOR WILLIAM T. BILLS BY HENRY G.3E|TZ ATTORNEY.

7 Jan. 10, 1967 w ET AL GOLLAPSIBLE DRUM 2 SheetsSheet 2 Filed April 4, 1963 5 mm. Tm m.

M m L n W HENRY G. SEITZ M AM ATTORNEY.

United States Patent COLLAPSIBLE DRUM William T. Bills, Clawson, and Henry G. Seitz, Detroit, Mich., assignors to United States Rubber Company, New York, N.Y., a corporation of New Jersey Filed Apr. 4, 1963, Ser. No. 270,762 3 Claims. (Cl. 156420) This invention relates to collapsible drums and, more particularly, to collapsible drums which are useful in building tire bands.

Prior collapsible tire building drums have ordinarily required frequent repairs as a result of the forces acting upon the hinge parts during motion of the drum segments. In prior drums hinges have been joined by pins which are effective as pivots for the hinge parts joining the drum segments. The hinge pins have been fitted in the hinge parts to allow relative rotation of the hinge parts with respect to the hinge pin.

It is an object of the present invention, therefore, to provide a new and improved collapsible drum which avoids the disadvantage of requiring frequent repairs.

In accordance with the invention, a collapsible drum comprises a rotatable segment-supporting spider having arms including hinge portions and peripheral drum segrnents having hinge portions. The drum also includes hinge pins extending through the hinge portions of the spider and extending through the hinge portions of the drum segments. At least one of the hinge pins has an extremity 'aifixed to a selected hinge portion to prevent relative rotation between the hinge pin and the selected hinge portion.

For a better understanding of the present invention, together with other and further objects thereof, reference is made to the following description, taken in connection with the accompanying drawings, and its scope will be pointed out in the appended claims.

Referring now to the drawings:

FIG. 1 is a fragmentary sectional view of a drum constructed in accordance with the present invention;

FIG. 2 is a fragmentary sectional view of the FIG. 1 drum, taken along line IIII of FIG. 1;

FIG. 3 is a fragmentary sectional view of the FIG. 1 drum, taken along line IIIIII of FIG. 1;

FIG. 4 is a fragmentary sectional view of the FIG. 1 drum, taken along line IVIV of FIG. 1;

FIG. 5 is a fragmentary sectional view of the FIG. 1 drum taken along line VV of FIG. 1; and

FIG. 6 is a fragmentary sectional view of the FIG. 1 drum in a collapsed condition.

Referring now more particularly to FIG. 1, a collapsible drum constructed in accordance with the invention may, for example, be a symmetrical 6-segment dnum 10 comprising a rotatable segment-supporting spider 11 having a central hub sleeve 12 adapted for mounting on a building machine shaft 13 which rotates the hub sleeve 12 and the spider 11 to collapse the drum in the manner represented in FIG. 6. The spider 11 has arms 14, 15, having hinge portions 16, 17 also represented in FIGS. 2-5.

The drum includes, for example, 6 peripheral drum segments of which three segments 19, 20, 21 are represented in FIGS. 1 and 6. The other segments omitted from the drawing are of similar construction to the three segments shown and are controlled in a manner similar to the segments 19, 20, 21 by suitable spider arms not shown. The drum segments 19, 20, 21 have hinge or lug portions 22, 23 and 24 welded to their respective segments.

' of the spider and binge pins 27, '28 extend through hinge portions of the drum segments. At least one of the hinge pins has an extremity aflixed to a selected hinge portion to prevent relative rotation between the one hinge pin and the selected hinge portion. More particularly, a sleeve 29 surrounds and is affixed to the extremity of the hinge pin 27. The sleeve 29 is also affixed to the adjacent hinge portion 22 to prevent relative rotation between the hinge .pin 27 and the hinge portion 22. To this end, the hinge pin may be recess welded to the sleeve 29 which may be welded to the hinge portion 22.

Also, a pin-supporting member 30 surrounds and is affixed to the extremity of the hinge pin 28. The pinsupporting member 30 is afiixed to a selected hinge portion 24 adjacent the other extremity of the hinge pin 28 to prevent relative rotation between the hinge pin 28 and the hinge portion 24. The pin 28 may be recess welded to the pin-suppotring member 30, which includes a suitable spacer block 31 bolted thereto and welded to hinge portion 24.

Suitable hardened bushings 27a, 2801 may be utilized to surround the hinge pins under the heads thereof to aid in minimizing wear of the hinge pins.

The hinge pin 27 is slip-fitted in the bushing 27a and the hinge pin 28 is slip-fitted in the hinge portion 23. The pins 27, 28 are affixed to the hinge portions 22, 24, respectively, by means of the sleeve 29 and pin-supporting member 30, respectively, as previously described. Suitable clearances exist between the hinge pins 27, 28 and the members which rotate thereon, namely, the hinge portions 24, 23, respectively.

As will be apparent from FIG. 5, the drum represented in the drawings has four sets of spider arms and the drum segments have hinge portions at both ends of the drum similar to those represented in FIG. 1.

We have found that a dnum constructed in accordance with the foregoing description has substantially longer life without breakage of the hinge pins. Further, the hinge pins may be readily replaced by drilling their welded extremities.

While there have been described what are at present believed to be the preferred embodiments of the invention, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the invention, and it is, therefore, aimed to cover all such changes and modifications as fall within the true spirit and scope of the invention.

Having thus described our invention, what we claim and desire to protect by Letters Patent is:

1. A collapsible drum comprising: a rota-table segmentsupporting spider having arms including hinge portions; peripheral dnurn segments having hinge portions; hinge pins extending through said hinge portions of said spider and extending through hinge portions of said drum seg' ments; at least one of said hinge pins having an extremity :afiixed to a selected hinge portion to prevent relative rotation between said one hinge pin and said selected hinge portion.

2. A collapsible drum comprising: a rotatable segmentsuppor-ting spider having arms including hinge portions; peripheral drum segments having hinge portions; hinge pins extending through said hinge portions of said spider and extending through hinge portions of said drum segments; a sleeve surrounding and afiixed to the extremity of at least one of said hinge pins extending through a pair of hinge portions of said drum segments; said sleeve also Patented Jan. 10, 1967 0 being afiixed to an adjacent hinge portion to prevent relative rotation between said one hinge pin and said adjacent hinge portion.

3. A collapsible drum comprising: a rotatable segmentsupporting spider having arms including hinge portions; peripheral drum segments having hinge portions; hinge pins extending through said hinge portions of said spider and said drum segments; a pin-supporting member surrounding and afiixed to the extremity of at least one of said hinge pins extending through a pair of hinge portions of said drum segments, said pin-supporting member being :afiixed to a selected hinge portion adjacent the other extremity of said one hinge pin to prevent relative rota- 4 tion between said one hinge pin and said selected hinge portion.

References Cited by the Examiner UNITED STATES PATENTS 1,835,986 12/1931 Heston 156-420 1,877,746 9/1932 Heston et al. 156-420 2,016,884 10/1935 Bostwick 156420 2,020,497 11/1935 Bostwick 156420 X EARL M. BERGERT, Primary Examiner.

HAROLD ANSHER, Examiner. 

1. A COLLAPSIBLE DRUM COMPRISING: A ROTATABLE SEGMENTSUPPORTING SPIDER HAVING ARMS INCLUDING HINGE PORTIONS; PERIPHERAL DRUM SEGMENTS HAVING HINGE PORTIONS; HINGE PINS EXTENDING THROUGH SAID HINGE PORTIONS OF SAID SPIDER AND EXTENDING THROUGH HINGE PORTIONS OF SAID DRUM SEGMENTS; AT LEAST ONE OF SAID HINGE PINS HAVING AN EXTREMITY AFFIXED TO A SELECTED HINGE PORTION TO PREVENT RELATIVE ROTATION BETWEEN SAID ONE HINGE PIN AND SAID SELECTED HINGE PORTION. 